What types of lighting can reduce your brainpower?

Spolier...The animals that were kept in dimmer light "lost about 30 percent of capacity in the hippocampus, a critical brain region for learning and memory, and performed poorly on a spatial task they had trained on previously.

https://www.inc.com/bill-murphy-jr/neuroscience-says-this-kind-of-lighting-can-reduce-brainpower-by-30-percent.html?cid=sf01002&sr_share=facebook